Looks pretty suspicious. I don't believe the hen plucking or rooster treading, more like rodents chewed your hens feathers. Have you seen mice or rats near your coop?
Our five porcelain chicks (about two weeks old now) are feathering out fast. Can't wait to see the feathered pattern emerge, because so far I'm very impressed....reminds me very much of moonstone. Will post pic later :D